The national capital has been brought under ground-to-air security cover with thousands of armed personnel keeping a tight vigil for the Republic Day celebrations.<br/><br/>The entire Central and New Delhi region will have nearly 50,000 security personnel drawn from Delhi Police and central security forces guarding every nook and corner for the full dress rehearsal today. A senior police official said, this time, police will use anti-drone technology to thwart any attack or identify any suspicious flying object. Apart from this, security personnel will be stationed atop tall buildings with anti-aircraft guns. <br/><br/>On January 25, Delhi borders will be sealed and all cars entering the national capital will be checked thoroughly. CCTV cameras have been installed and eight control rooms have been set up to monitor the feed from the cameras. Various security layers have been put in place and Delhi Police personnel along with paramilitary and NSG commandos have been deployed.